start to move CRM configurations into files.

config.go

 //APIConfig contains secrets that cannot store in source file
 var APIConfig WechatAPIConfig
 
+type EspoCRMAPIConfig struct {
+
+	//where the EspoCRM is installed
+	BaseURL string `json:"BaseURL"`
+
+	//access UserName
+	UserName string `json:"UserName"`
+
+	//access Password
+	UserPass string `json:"password"`
+}
+
+//CRMConfig contains secrets that cannot store in source file
+//
+var CRMConfig EspoCRMAPIConfig
+
 func readConfig() error {
 
 	log.Printf("read config from %s\r\n", "server_config.json")